ABB Relion 670 Series Applications Manual page 208

Section 13
Secondary system supervision
13.2.3.3 Negative sequence based
The relay setting value
set lower than the value that is calculated according to equation 99.

3 V 2 PU
EQUATION1757-ANSI V4 EN-US
where:
V2PU
VBase
The setting of the current limit
must be higher than the normal unbalance current that might exist in the system and can be
calculated according to equation 100.

3 I 2 PU
EQUATION1758-ANSI V4 EN-US
where:
I2
IBase
13.2.3.4 Zero sequence based
The IED setting value
3V0PU should not be set lower than the value that is calculated according to equation 101.
3 V 0 PU
EQUATION1759-ANSI V4 EN-US
where:
3V0
VBase
The setting of the current limit
be higher than the normal unbalance current that might exist in the system. The setting can be
calculated according to equation 102.
202
3V2PU is given in percentage of the base voltage VBase and should not be
V 2

100
VBase 3
is the maximal negative sequence voltage during normal operation conditions, plus a margin of 10...20%
is the base voltage for the function according to the setting
3I2PU is in percentage of parameter IBase . The setting of 3I2PU
I 2

100
IBase
is the maximal negative sequence current during normal operating conditions, plus a margin of 10...20%
is the base current for the function according to the setting
3V0PU is given in percentage of the base voltage VBase . The setting of
3 V 0
 
100
VBase 3
is the maximal zero sequence voltage during normal operation conditions, plus a margin of 10...20%
is the base voltage for the function according to the setting
3I0PU is done in percentage of IBase . The setting of pickup must
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1MRK 511 407-UUS Rev. J
GlobalBaseSel
GlobalBaseSel
GlobalBaseSel
Phasor measurement unit RES670
Application manual
M13683-17 v9
(Equation 99)
(Equation 100)
M13683-43 v8
(Equation 101)